Generally a small fraction of sulfur (S) in coal is converted to SO3 in coal-fired combustion devices such as electric utility boilers. The emissions of SO3 from such a boiler depend on coal S content combustion conditions flue gas characteristics and air pollution devices being used.
Jun 15 1994 · Unit One is a pulverized coal-fired dry bottom boiler with an opposed firing configuration. Low NOx burners are used to control NOx emissions. Normal operating temperature in the combustion zone is approximately 2000 - 3000 degF. The boiler produces 4500000 lb/hr of steam for a General Electric steam turbine generator rated at 688 MWe.